Am I missing something. I've had your game for a while on Mac and was sure I'd been playing with a pad. It's been many months, but I've come back to it this evening and my pad isn't being recognised. Other games seem fine, but I'm having no joy here.
Feel free to contact me via any of the methods at www.bitglint.co.uk but I'm not sure what I'll be able to do. Gamepad detection is built into the Monogame framework, and I'm not a Mac person, so the odds are already stacked against us! :o)